
# print("\a")
# help(int)
# count=0
# def sum(a,b):
#     global count
#     count = a +b
#     print(count)
# sum
# print(count)
# print(list(filter(None,[1,0,False,True])))

# temp = range(10)
# # print(list(temp))
# show  = list(filter(lambda x:x%2,temp))
# print(show)
# def add1():
#     return add1()
# add1()
# def jiecheng(x):
#     if x==1:
#         return 1
#     else:
#         return x*jiecheng(x-1)
# print(jiecheng(10))